LAB TEN

Subnetting

The labs objective was to set up a total of 7 networks, and with 5 total hosts on a B-Class network with the default subnet of 129.130.0.0, with this we discussed having to borrow bits and came up with the default subnet we used 129.130.224.0. We came up with this by realizing we have to have seven networks so we used the equation 2^3>= 7

First bit values (binary) First byte value (decimal) 0– – –223. Number of network identifier bits Number of host identifier bits. Number of possible networks ,384. 2,097,152. Number of possible hosts. 16,777, , © 2013 John Wiley & Sons, Inc.

129.130.224.0

after my colleagues and i had a general idea of what an outline for this network would look like having our default subnet, we took to the whiteboard to put sketch it out.

the First iteration of the outline used to create the Network constructed in the lab

Akin to LAB SEVEN – TCP/IP NETWORK we were tasked with changing the default ip of the hosts we intended to use. By going into the adapter settings of the host computers each of us was able to change the default ip address of the hosts to our corresponding colors. During this phase my constituents and I located four routers and attached the DCE cables to the corresponding routers as to align with our outline. I was fortunate enough to be the Red Router network. The Blue Router Network or ‘Blue’ for short and Myself were tasked with setting up not one, not two, But Three different networks.

Image result for Cisco router dce dte
DCE and DTE Cables like these are what was used to interconnect the Cisco Routers used in this lab.
an actual picture from the lab, my router being the top one, and the Blue networks router being the bottom router.

After the routers were all plugged into eachother we connected our hosts to switched via ethernet and then connected the ethernet cables from the switch to the router.

Now that all the hardware was set up and the IP addresses are changed we revisit the program used in previous labs, a program called “Hyperterminal” which gives us the ability to configure the router.

to configure the router we were tasked with using the commands:

  • n (as to not auto configure the router)
  • en (enabling us to configure the router)
  • config t (allowing us to configure the router via a terminal)
  • int e0 (assuming the interface ethernets port thats being used)
  • IP add nnn.nnn.nnn.nnn sss.sss.sss.sss (129.130.64.1 for the ip and 255.255.0.0 for the subnet mask )
  • no shutdown (this one is important to have on three networks, it is something i personally forgot to do and cause the router to be unable to connect to the other networks)
  • exit
  • router rip (this allows us to enable the routing protocol)
  • network
  • network
  • exit
  • exit
  • copy run start (saves config)
  • show run (shows running config)

*Its important to know that the DCE serial connection needs a clock rate signal, for this we used the command “clock rate 64000” for the connection*

the final iteration of the outline that allowed us to set up the network that yielded a reply from a ping from the green network to the black network!

After testing, and pinging vigorously, on all side of the the three networks and plugging and unplugging cords and turning off and on certain pieces of hardware we finally after all the headaches and troubleshooting, we were able to ping from the red network to the green network and received a reply. this was very good news as it confirmed the red network was setup properly, and later the green network was able the ping the red network and receive a reply, more good news there.

AND THEN FINALLY….

Like a game winning touchdown, or some kind of miracle from the gods above a ping was sent from the ip address 129.130.224.2 [GREEN NETWORK] to ip address 129.130.192.2[BLACK NETWORK]. as everyone sat there waiting the heavens themselves parted and a reply was given back with a status of 112ms. The entire class broke into tears at this joyous occasion and from that day on we became a family (not really but it was a very cool experience in my personal opinion.)